[Feat] Display 'No Threads Found' Message in Thread Sidebar When No Threads Exist

[Giridharan002]

Description

This PR addresses the issue where the No Threads Found message is not displayed in the thread sidebar when there are no threads in the chat. The solution ensures that the message, along with an icon, is shown to indicate the absence of threads, improving the user experience by providing clear feedback.

Before fix

After fix

https://github.com/RocketChat/EmbeddedChat/assets/123318221/ffe2a14b-fb1d-4ac2-a725-e2c40fd07068

• [X] The "No Threads Found" message with an icon is displayed in the thread sidebar when there are no threads.
• [X] The solution does not break any existing functionality.

Fixes : #529

[Spiral-Memory]

LGTM !

[Giridharan002]

Hello @Giridharan002 thanks for the PR! Seems like you forgot to run format, can you please do that? After that, its good to go!

Hello @sidmohanty11 , I've run the formatter and pushed the changes. Can you review this once again? Thank you!